Hand Tool Protection Device

ABSTRACT

A hand tool protection device with a protective hood which at least partially surrounds a reception region for a tool is disclosed. The hand tool protection device has at least one stabilizing bar which is arranged on the protective hood in at least one operationally ready state and which directly delimits the reception region at at least one point.

This application claims priority under 35 U.S.C. §119 to German patentapplication no. DE 10 2010 030 598.7, filed Jun. 28, 2010 in Germany,the disclosure of which is incorporated herein by reference in itsentirety.

BACKGROUND

Hand tool protection devices for an angle grinding machine with aprotective hood which delimits a reception region for a tool from asingle axial direction and partially in the circumferential directionare already known.

SUMMARY

The disclosure proceeds from a hand tool protection device with aprotective hood which at least partially surrounds a reception regionfor a tool.

It is proposed that the hand tool protection device have at least onestabilizing bar which is arranged on the protective hood in at least oneoperationally ready state and which directly delimits the receptionregion at at least one point. A “tool” is to be understood in thiscontext as meaning, in particular, a separating and/or grinding wheel. A“reception region for a tool” means, in particular a spatial regionwhich to a maximum is occupied and/or swept by the tool in at least oneoperating state. A “protective hood” is to be understood as meaning, inparticular, a unit which, particularly by virtue of its spatialarrangement between the tool and an operator, protects the latter fromgrinding constituents, such as, in particular, from a workpiece and/orthe tool, and, if the tool bursts, from splinters. A “stabilizing bar”is to be understood, in particular, to mean a unit which deviates from aperipheral collar of the protective hood and which preferably extends ina bridge-like manner transversally from a first marginal region to asecond marginal region of the protective hood, in particular on anunderside of the protective hood. A “peripheral collar of the protectivehood” is to be understood in this context as meaning, in particular, amargin of the protective hood which is bent round in the direction ofthe reception region of the tool. Furthermore, an “underside of theprotective hood” is to be understood here and hereafter as meaning, inparticular, a region of the protective hood which lies opposite,especially in parallel, to a top side of the protective hood, while a“top side of the protective hood” is to be understood as meaning, inparticular, a region of the protective hood which has a covering walland a coupling point for coupling to a hand-operated machine tool, andwhich, in the mounted state of the protective hood, is pierced at atleast one point by a drive shaft for the tool and faces a drive unit ofthe hand-operated machine tool. The covering wall of the top side of theprotective hood preferably has adjoining it in the direction of theunderside a segment of a surface area. In an advantageous configuration,the stabilizing bar is stretched at least essentially parallel to thecovering wall over the open underside of the protective hood, so thatthe tool can rotate contactlessly between the top side of the protectivehood and the stabilizing bar. That the stabilizing bar is arranged “atleast essentially parallel to the covering wall” is to be understood asmeaning, in particular, that an angle between a straight lineperpendicular to a main plane of extent of the covering wall of theprotective hood and a straight line perpendicular to a main plane ofextent of the stabilizing bar amounts to less than 20°, advantageouslyto less than 10° and especially advantageously to less than 5°. That astabilizing bar “directly delimits the reception region at at least onepoint” is to be understood as meaning that, during at least oneoperationally ready state, there is no solid body located on animaginary section between this point and at least one point of thereception region. The stabilizing bar is fastened, in particular, to amotor housing and/or to a gear housing and/or to the protective hood ofthe hand-operated machine tool. A dimension and/or position of thestabilizing bar may be different, depending on the type of protectivehood and on machine and/or tool size. Furthermore, it is conceivable touse two or more such stabilizing bars. An especially rigid andlightweight protective hood, along with good access to the tool, can beachieved by means of an appropriate configuration.

In a further configuration, it is proposed that the hand tool protectiondevice have at least one fastening unit, by means of which thestabilizing bar is fastened at at least one point on the protective hoodin at least one operationally ready state. Preferably, the stabilizingbar is fastened to the protective hood at least at two spatiallyseparate points. Various connection technologies appearing appropriateto a person skilled in the art may be envisaged, but, in particular,riveting, spot or seam welding, adhesive bonding, clamping and/orscrewing. Preferably, a prefitting facility may be provided on theprotective hood, so that retro fitting with a stabilizing bar accordingto the disclosure is possible. A particularly effective stabilization ofthe protective hood can be achieved by fastening to the protective hood.Especially when a continuously open underside of a protective hood isstiffened by means of a transversally running stabilizing bar, a collarof the protective hood can advantageously be protected againstdeformation, for example if a hand-operated machine tool inadvertentlyfalls.

Moreover, it is proposed that the hand tool protection device have atleast one fastening unit which is provided for fastening the stabilizingbar releasably to at least one component. Here and hereafter, “provided”is to be understood, in particular, as meaning specially designed and/orequipped. In this context, a “component” is to be understood, inparticular, as meaning a motor housing, a gear housing and/or,advantageously, the protective hood of the hand-operated machine tool.Preferably, the stabilizing bar is fastened releasably without the useof a tool. Advantageously, the hand-operated machine tool has a securingmechanism which prevents operation when the stabilizing bar is releasedand/or removed. Good access to the tool can be achieved as a result ofthe releasable fastening, thus making it possible, in particular, tochange a separating or grinding wheel simply and conveniently, theadvantageous consequence of this being that it is possible to avoidneglecting an appropriate safety precaution.

Furthermore, it is proposed that the hand tool protection device have atleast one bearing unit which is provided for mounting the stabilizingbar pivotably. Especially simple access to the reception region of thetool can thereby be achieved. Advantageously, the stabilizing bar isfastened inseparably to the bearing unit, and therefore, in particular,a loss of the stabilizing bar can be avoided.

Furthermore, it is proposed that the hand tool protection device have atleast one bearing unit which is provided for mounting the stabilizingbar displaceably at least essentially along a main direction of extentof the stabilizing bar. The term “displaceably mounted” is to beunderstood, in particular, as meaning that the stabilizing bar ismounted with translational motion, in particular in order to be guidedfrom an operating position into a position in which the tool can beremoved from the reception region. Here and hereafter, a “main directionof extent” is to be understood, in particular, as meaning a direction ofa longest extent between two marginal points of the stabilizing bar. Adirection directed “at least essentially along a main direction ofextent” is to be understood, in particular, as meaning a direction ofwhich the deviation from the main direction of extent amounts to lessthan 30°, advantageously to less than 20° and especially advantageouslyto less than 10°. Simple and rapid access to the reception region of thetool can thereby be achieved.

In an advantageous form of the disclosure, it is proposed that thestabilizing bar at least partially surround the protective hood. That“the stabilizing bar at least partially surrounds the protective hood”is to be understood, in particular, as meaning that the stabilizing barhas at least one part region which covers and/or touches an outside,facing away from the reception region of the tool, of the protectivehood. Especially high stabilization of the protective hood can therebybe achieved. Furthermore, an especially rigid connection between theprotective hood and the stabilizing bar is made possible.

Furthermore, it is proposed that the stabilizing bar be contoured in aregion in which it directly delimits the reception region. That “thestabilizing bar is contoured in a region in which it directly delimitsthe reception region” is to be understood, in particular, as meaningthat at least one cross-sectional face of the stabilizing barperpendicular and/or parallel to the main direction of extent of thelatter is different, in a region in which the stabilizing bar directlydelimits the reception region, from at least one single trapezoidalface, in particular a single parallelogram face and, in particular, asingle rectangle face. The elasticity properties of the stabilizing barcan thereby be varied. Advantageously, the stabilizing bar is profiledand/or has one or more beads and/or one or more lowered margins, withthe result that the rigidity of the stabilizing bar can advantageouslybe increased. If the stabilizing bar has perforations and/or cutouts, inparticular on a marginal region, weight and material can be saved and/orelasticity of the stabilizing bar in the vicinity of the perforationsand/or cutouts can advantageously be increased.

Advantageously, the hand tool protection device has at least one springunit and/or magnet unit which is provided for fixing the stabilizing barin at least one operationally ready state by means of spring forceand/or magnetic force. Simple and convenient operability can thereforebe achieved. Advantageously, a closing mechanism for fixing thestabilizing bar is closed by means of the spring unit and/or magnetunit. An especially simple and conveniently operable fixing mechanismfor the stabilizing bar can thereby be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages may be gathered from the following drawingdescriptions. Exemplary embodiments of the disclosure are illustrated inthe drawings. The drawings, descriptions and claims contain numerousfeatures in combination. A person skilled in the art will expedientlyalso consider the features individually and combine them into expedientfurther combinations.

In the drawings:

FIG. 1 shows a hand-operated machine tool in the form of an anglegrinder with a hand tool protection device according to the disclosurein a perspective view,

FIG. 2 shows the hand tool protection device from FIG. 1 in anindividual illustration from below,

FIG. 3 shows a further hand tool protection device with a removablestabilizing bar from below,

FIG. 4 shows a further hand tool protection device with a clockwisepivotable stabilizing bar from below,

FIG. 5 shows a further hand tool protection device with acounterclockwise pivotable stabilizing bar from below,

FIG. 6 shows a further hand tool protection device with a stabilizingbar pivotable via a web in a perspective view,

FIG. 7 shows a further hand tool protection device with a pivotablestabilizing bar in a perspective view,

FIG. 8 shows a further hand tool protection device with a removablestabilizing bar which as far as possible surrounds a protective hood, ina perspective view,

FIG. 9 shows a further hand tool protection device with a removablestabilizing bar in a perspective view,

FIG. 10 shows a further hand tool protection device with a removablestabilizing bar in two perspective views,

FIG. 11 shows a further hand tool protection device with a stabilizingbar fixed by means of a snap fastening, in a perspective view,

FIG. 12 shows a further hand tool protection device with an alternativesnap fastening in a perspective view,

FIG. 13 shows a further hand tool protection device with a pivotablestabilizing bar and with a spring unit in a perspective view,

FIG. 14 shows a further hand tool protection device with an alternativespring unit in a perspective view,

FIG. 15 shows a further hand tool protection device with a furtheralternative spring unit in a perspective view,

FIG. 16 shows a further hand tool protection device with a displaceablestabilizing bar and with a spring unit formed in one piece with thestabilizing bar, in a perspective view,

FIG. 17 shows a further hand tool protection device with a displaceablestabilizing bar and with a spring unit fastened to the stabilizing bar,in a perspective view,

FIG. 18 shows a further hand tool protection device with a displaceablestabilizing bar and with a spring unit fastened to a protective hood onboth sides, in a perspective view,

FIG. 19 shows a further hand tool protection device with a displaceablestabilizing bar and with a spring unit fastened to a protective hood onone side, in a perspective view, and

FIG. 20 shows a hand tool protection device according to the disclosurewith a removable stabilizing bar in a further configuration in a viewfrom above and a view from below.

DETAILED DESCRIPTION

FIG. 1 shows a hand-operated machine tool, more precisely an anglegrinder 50 a, in a perspective view obliquely from below. The anglegrinder 50 a comprises a motor housing 54 a, which is designed in theform of an operating grip 52 a, and a gear housing 56 a which adjoinsthe motor housing 54 a. The gear housing 56 a has, on a driven side, anorifice 42 a, through which an output shaft, not illustrated in any moredetail, of a gear unit of the hand-operated machine tool is led and isprovided for coupling to a tool, in particular to a separating orgrinding wheel. Moreover, the angle grinder 50 a comprises a hand toolprotection device with a flat protective hood 10 a which has a couplingpoint 46 a to the gear housing 56 a. Furthermore, the protective hood 10a comprises a part-disk-shaped covering wall 36 a of a top side 44 a ofthe protective hood 10 a and also a surface area 40 a which in a lowermarginal region forms a radially inwardly bent collar 48 a. Theprotective hood 10 a partially surrounds a reception region 12 a for thetool, not illustrated. A stabilizing bar 14 a of the hand toolprotection device, which stabilizing bar is fastened at each of its twoopposite ends at a part region of the protective hood 10 a runs parallelto the covering wall 36 a on an underside 38 a of the protective hood 10a (FIG. 2). In the present case, the stabilizing bar 14 a consists ofthe same material as the protective hood 10 a, specifically of sheetmetal. The stabilizing bar 14 a and the protective hood 10 a areproduced in a stamping and bending operation. It is also conceivable,however, to manufacture the stabilizing bar 14 a from a material otherthan that of the protective hood 10 a. The stabilizing bar 14 a directlydelimits the reception region 12 a for the tool on a side of thereception region 12 a which faces away from the covering wall 36 a. Forfixing the stabilizing bar 14 a to the protective hood 10 a, the handtool protection device comprises fastening units 16 a, 18 a, thefastening unit 16 a fastening the stabilizing bar 14 a releaseably tothe protective hood 10 a. The fastening unit 16 a comprises a lockingpin 60 a which is led through the stabilizing bar 14 a and with a hammerhead, not illustrated in any more detail, through a hole contour of theprotective hood 10 a and is rotated, in order to make a releasablepositive connection between the locking pin 60 a and the protective hood10 a. The hole contour is integrally formed on the surface area 40 a ofthe protective hood 10 a, a main plane of extent of the hole contourbeing parallel to the covering wall 36 a of the protective hood 10 a andtouching a marginal region of the collar 48 a of the protective hood 10a. The fastening unit 18 a comprises a bearing bolt 62 a which isconnected fixedly to the stabilizing bar 14 a and is mounted pivotablyin the protective hood 10 a. The bearing bolt 62 a forms a bearing unit24 a which is provided for mounting the stabilizing bar 14 a pivotably.After the locking pin 60 a of the fastening unit 16 a has been releasedby being rotated in a direction of rotation 66 a, the stabilizing bar 14a can be pivoted about the bearing bolt 62 a of the bearing unit 24 aover the collar 48 a of the protective hood 10 a in the direction 68 ain order to free the tool, not illustrated. For this purpose, slightraising of the stabilizing bar 14 a at an end facing the fastening unit16 a and therefore elastic bending of the stabilizing bar 14 a arenecessary in order to draw the hammer head of the locking pin 60 a outof the hole contour. On account of its elasticity, the stabilizing bar14 a returns to its initial position when the action of force upon itsend facing the fastening unit 16 a is cancelled. The locking pin 60 a isconnected captively to the stabilizing bar 14 a, that may alternativelybe designed as an individual part. Instead of a locking pin 60 a with ahammer head, a rotary bayonet fastening, a one-sided hooked pin or anyother mechanical closure which obeys the “keyhole principle” maylikewise be envisaged. Furthermore, it is conceivable that the bearingbolt 62 a is connected fixedly to the protective hood 10 a and pivotablyto the stabilizing bar 14 a.

Alternative exemplary embodiments are illustrated in FIGS. 3 to 20.Components, features and functions which remain essentially the same arebasically designated by the same reference symbols. However, todistinguish the exemplary embodiments, the letters a to s are added tothe reference symbols of the exemplary embodiments. The followingdescription is restricted essentially to the differences from theexemplary embodiment in FIGS. 1 and 2, and as regards components,features and functions which remain the same reference may be made tothe description of the exemplary embodiment in FIGS. 1 and 2.

FIG. 3 shows a variation of the principle from FIG. 2. For the sakeg ofgreater clarity, a stabilizing bar 14 b is shown here only incompletely.Instead of a bearing bolt, as in the previous exemplary embodiment, afurther locking pin 60 b with a hammer head is used here, thus making itpossible to remove the stabilizing bar 14 b. Especially advantageousaccess to a tool is thereby achieved. When the stabilizing bar 14 b isfastened, the two locking pins 60 b engage in each case with theirhammer head in hole contours 64 b and are rotated, so that the hammerheads, engaging behind the hole contours 64 b, form a releasableconnection between a protective hood 10 b and the stabilizing bar 14 b.The hole contours 64 b, only one of which is shown in FIG. 3, areintegrally formed on a surface area 40 b of the protective hood 10 bsuch that their main plane of extent is parallel to a covering wall 36 bof the protective hood 10 b, the main plane of extent touching amarginal region of the collar 48 b of the protective hood 10 b.Alternatively, only one locking pin 60 b at a first end of thestabilizing bar 14 b can also be used, there being provided at a secondend, lying opposite the first end, of the stabilizing bar 14 b a fixedform contour which is identical to a locking contour of a securedlocking pin 60 b. This form contour may be integrated, in particularintegrally formed, in one piece at the second end of the stabilizing bar14 b or may be mounted subsequently. In order to remove the stabilizingbar 14 b, a remaining locking pin 62 b first has to be opened at thefirst end of the stabilizing bar 14 b by being rotated, and then thestabilizing bar 14 b has to be rotated into a position which makes itpossible to disconnect the form contour from the hole contour 64 b.

In a further design variant according to FIG. 4, a spring unit 32 c ofthe hand tool protection device is provided for fixing a stabilizing bar14 c by spring force and for holding it in a closed position. The handtool protection device has a bearing unit 24 c which comprises a bearingbolt 62 c fastened to the stabilizing bar 14 c. The bearing bolt 62 c ismounted pivotably on a top side, facing away from a reception region 12c, of a covering wall 36 c of a protective hood 10 c. The stabilizingbar 14 c is prolonged, at a first end facing the bearing unit 24 c,beyond a collar 48 c and a surface area of the protective hood 10 c, isbent round in the direction of the top side of the covering wall 36 cand is led over an outside, facing away from the reception region 12 c,of the surface area and over the top side of the covering wall 36 c asfar as the bearing unit 24 c. In a viewing direction perpendicular tothe covering wall 36 c, the bearing unit 24 c is offset with respect tothe stabilizing bar 14 c perpendicularly to a main direction of extentof the stabilizing bar 14 c. At its second end, the stabilizing bar 14 cis clamped under a hook 72 c which engages over it and which isintegrally formed in the collar 48 c of the protective hood 10 c. Thespring unit 32 c has a leg spring 100 c which is provided for fixing themounted stabilizing bar 14 c under the hook 72 c by means of springforce. For this purpose, the leg spring 100 c is coiled with itsscrew-like middle piece around the bearing bolt 62 c, a first leg 104 cof the leg spring 100 c being fastened to the covering wall 36 c and asecond leg 102 c of the leg spring 100 c being fastened to thestabilizing bar 14 c. To release the stabilizing bar 14 c, the latterfirst has to be pivoted counter to the spring force, that is to saycounterclockwise in FIG. 4, so that the stabilizing bar 14 c can belifted with its second end over the hook 72 c by being slightly bent.Thereupon, the stabilizing bar 14 c can be pivoted with the assistanceof spring force, that is to say clockwise in FIG. 4, over the collar 48c of the protective hook 10 c and thereby be opened completely. Insteadof the leg spring 100 c, other spring types, but also a latching and/orother fixings for the stabilizing bar 14 c, may also be envisaged inalternative configurations.

The design variant according to FIG. 5 differs from the versionaccording to FIG. 4 in an offset bearing unit 24 d and in a reversedpivoting direction for opening or closing a stabilizing bar 14 d. Aposition of the bearing unit 24 d is chosen particularly in light ofconstruction space conditions, reasons for mounting or othercircumstances.

In the embodiment illustrated in FIG. 6, a stabilizing bar 14 esurrounds a protective hood 10 e at two angled ends of the stabilizingbar 14 e which are arranged along a main direction of extent of thestabilizing bar 14 e. The hand tool protection device has a bearing unit24 e with a hinge 96 e which is arranged on a surface area 40 e of theprotective hood 10 e and which mounts the stabilizing bar 14 e pivotablyvia a central web 76 e perpendicular to the main direction of extent.The protective hood 10 e undergoes further stiffening by means of theweb 76 e. The stabilizing bar 14 e is fixed via two releasable fasteningunits 16 e at the angled ends of the stabilizing bar 14 e, only onefastening unit 16 e being illustrated in FIG. 6. The angled ends of thestabilizing bar 14 e engage over the surface area 40 e of the protectivehood 10 e and there have spring-loaded fastenings 98 e in the form ofhinged lids. With the stabilizing bar 14 e mounted, locking pins 60 eintegrally formed on the fastenings 98 e engage positively into matchingrecesses of the surface area 40 e. The stabilizing bar 14 e isadditionally held between hooks 72 e, 74 e integrally formed on thesurface area 40 e. The stabilizing bar 14 e is opened in that thefastenings 98 e are moved outward counter to spring force and thelocking pins 60 e are thus drawn out of the corresponding recesses inthe surface area 40 e of the protective hood 10 e. Alternatively,securing by locking pin may also be implemented only at one of theangled ends of the stabilizing bar 14 e. The locking pins 60 e may alsobe fastened to the surface area 40 e of the protective hood 10 e, andthe fastenings 98 e may in each case have a corresponding recess.

In a further exemplary embodiment according to FIG. 7, a stabilizing bar14 f has a bearing unit 24 f at a first of its two ends and a fasteningunit, not illustrated in any more detail, at a second end. The fasteningunit is provided for fastening the stabilizing bar 14 f releasably, anyfastening unit which seems appropriate to a person skilled in the artbeing conceivable. The bearing unit 24 f comprises a hinge 96 f,integrally formed on a collar 48 f of the protective hood 10 f, forpivoting the stabilizing bar 14 f in a plane perpendicular to a coveringwall 36 f of the protective hood 10 f.

In a solution according to FIG. 8, a stabilizing bar 14 g surrounds aprotective hood 10 g, a collar 48 g of the protective hood 10 g beinguninterrupted, thereby advantageously increasing the rigidity of theprotective hood 10 g. The two ends of the stabilizing bar 14 g are ineach case prolonged beyond the collar 48 g, are bent round there in thedirection of a covering wall 36 g and then run along an outside, facingaway from a reception region 12 g, of a surface area 40 g of theprotective hood 10 g as far as the covering wall 36 g where the two endsof the stabilizing bar 14 g are bent round anew so as then to runparallel to a top side, facing away from the reception region 12 g, ofthe covering wall 36 g. The stabilizing bar 14 g is fixed to the topside of the covering wall 36 g by means of fastening units 16 g, 18 g.The fastening units 16 g, 18 g in each case comprise rim holes, equippedwith a thread 80 g, 82 g, in the covering wall 36 g of the protectivehood 10 g, the said rim holes being provided for receiving screws whichfasten the stabilizing bar 14 g to the covering wall 36 g from the topside of the covering wall 36 g. To make assembly easier, long holes 78 gopen on one side are provided at both ends of the stabilizing bar 14 g.It would be conceivable to optimize the fastening units 16 g, 18 g if inorder to fix the stabilizing bar 14 g, for example, a shouldered collarscrew is used and a collar of the collar screw fits into a round holeintegrally formed at a closed end of the long holes 78 g of thestabilizing bar 14 g. Joining by means of the long hole 78 g can thentake place easily, the coil of the coil screw positively preventing thestabilizing bar 14 g from sliding out after the collar screw has beenfixed. Furthermore, alternatively, a pivotable fastening of thestabilizing bar 14 g by means of a one-sided bearing unit according toFIGS. 4 and 5 may also be used (not illustrated). In the design variantshown in FIG. 9, too, a stabilizing bar 14 h surrounds a protective hood10 h, a collar 48 h of the protective hood 10 h also being interruptedhere. The two ends of the stabilizing bar 14 h are in each caseprolonged beyond the collar 48 h, are bent round there in the directionof a covering wall 36 h and then run along an outside, facing away froma reception region 12 h, of a surface area 40 h of the protective hood10 h as far as fastening units 16 h over half the distance between thecollar 48 h and covering wall 36 h. Each fastening unit 16 h comprisesan outwardly drawn collar, provided with a thread 80 h, on the surfacearea 40 h. The collar fits positively into a round hole of a holecontour 64 h which is provided at each of the two ends of thestabilizing bar 14 h and is in the form of a long hole, open on oneside, at the closed end of which the round hole is integrally formed. Ascrew 84 h is provided for fixing the stabilizing bar 14 h, thus makingit possible to have an especially securely positioned connection. Duringinstallation, the slightly elastic stabilizing bar 14 h is slipped withthe round hole over the collar on the surface area 40 h and is thereuponfixed by means of the screw 84 h.

FIG. 10 shows a variation of the principle from FIG. 9 from twoperspectives. In this variant, too, a collar 48 i of a protective hood10 i is uninterrupted. A fastening unit 16 i for a stabilizing bar 14 icomprises here a thread 80 i in a collar, drawn inward in the directionof a reception region 12 i, on a surface area 40 i of the protectivehood 10 i. The stabilizing bar 14 i again has two ends which areprolonged beyond a collar 48 i and are bent round in the direction of acovering wall 36 i and which are in each case fixed, from a side facingaway from the reception region 12 i, to the thread 80 i by means of ascrew 84 i. For this purpose, long holes 78 i open on one side are againprovided at the ends of the stabilizing bar 14 i, a positive connectionbeing achieved in each case by means of two hooks 72 i which areintegrally formed directly next to the long holes 78 i and come to bearagainst a screw head of the screw 84 i when the stabilizing bar 14 i isbeing mounted. Additional hooks 74 i on the surface area 40 i of theprotective hood 10 i serve for securing an exact position and prevent askewing of the stabilizing bar 14 i.

In the design variant shown in FIG. 11, the two ends of a stabilizingbar 14 j are in each case prolonged beyond a collar 48 j of a protectivehood 10 j, are bent round there in the direction of a covering wall 36 jand then run along an outside, facing away from a reception region 12 j,of a surface area 40 j of the protective hood 10 j. In the region of thesurface area 40 j, the ends of the stabilizing bar 14 j have in eachcase a part which is angled in the circumferential direction of thesurface area 40 j and which is provided for being pushed positively andin the circumferential direction into a corresponding shackle 88 j. Theshackles 88 j are formed by pressed-out regions of the surface area 40 jof the protective hood 10 j. Alternatively, the shackles 88 j may beproduced in any way which seems appropriate to a person skilled in theart. They may, for example, be integrally formed, in particular slotted,and/or also put in place, in particular spot-welded, seam-welded,adhesively bonded and/or screwed. The stabilizing bar 14 j is held inits position by fastenings 98 j in the form of small elastic platesfastened to the surface area 40 j. To free the stabilizing bar 14j, thesmall elastic plates of the fastening 98 j have to be pressed inwardlycounter to spring force for the surface area 40 j under the stabilizingbar 14 j which can then be drawn out of the shackles 88 j. In analternative embodiment, it is also conceivable that the small elasticplates have to be drawn outward in order to release the stabilizing bar14 j. There may also be only one fastening 98 j provided at one of thetwo ends of the stabilizing bar 14 j. Instead of the small elasticplates, it would also be conceivable to have for the fastenings 98 j,for example, a toggle lever system which is fastened to the surface area40 j of the protective hood 10 j on both sides of the stabilizing bar 14j and which secures the position of the stabilizing bar 14 j byprestress (not illustrated).

In the variant shown in FIG. 12, the two ends of a stabilizing bar 14 kare likewise prolonged beyond a collar 48 k of a protective hood 10 k,are bent round there in the direction of a covering wall 36 k and thenrun perpendicularly to the covering wall 36 k along an outside, facingaway from a reception region 12 k, of a surface area 40 k of theprotective hood 10 k. The two ends of the stabilizing bar 14 k are ineach case inserted in a shackle 88 k which, as in the embodimentaccording to FIG. 11, is likewise put in place and/or integrally formed.The stabilizing bar 14 k has at each of its two ends a recess, intowhich, with the stabilizing bar 14 k mounted, a locking pin 60 k engagespositively, the said locking pin being attached to a hinged lid 98 khaving spring securing means. To demount the system, the hinged lids 98k are drawn outward, with the result that the locking pins 60 k aredrawn out of the recesses of the stabilizing bar 14 k and free thelatter. Alternatively, one-sided securing in the stabilizing bar 14 k bymeans of a locking pin 60 k could also be envisaged.

FIGS. 13, 14 and 15 show in each case a stabilizing bar 14 l; 14 m; 14 nwhich is mounted on a bearing unit 24 l; 24 m, 26 m; 24 n and which ispivotable in a direction 66 l; 66 m; 66 n in a plane perpendicular to acovering wall 36 l; 36 m; 36 n of a protective hood 10 l; 10 m; 10 n. Inthis case, the stabilizing bar 14 l; 14 m; 14 n in each case with itstwo ends surrounds a collar 48 l; 48 m; 48 n and a surface area 40 l; 40m; 40 n of the protective hood 10 l; 10 m; 10 n from an outside, facingaway from a reception region 12 l; 12 m; 12 n, of the surface area 40 l;40 m; 40 n. Each of the bearing units 24 l; 24 m, 26 m; 24 n has abearing bolt 62 l; 62 m, 63 m; 62 n which is fastened to the stabilizingbar 14 l; 14 m; 14 n and which mounts the stabilizing bar 14 l; 14 m; 14n on the surface area 40 l; 40 m; 40 n of the protective hood 10 l; 10m; 10 n. The embodiments according to FIGS. 13, 14 and 15 differessentially in a spring unit 32 l; 32 m; 32 n which fixes thestabilizing bar 14 l; 14 m; 14 n in its position in a mounted state. Inthe embodiment according to FIG. 13, the spring unit 32 l comprises afastening 98 l in the form of a spring-loaded lever displaceable in thecircumferential direction 68 l of the surface area 40 l. When thestabilizing bar 14 l is in a mounted state, a locking pin connected inone piece to the lever engages positively into a groove 92 l cut out onthe stabilizing bar 14 l. To free the stabilizing bar 14 l, the leverhas to be displaced counter to spring force along the circumferentialdirection 68 l so that the locking pin is drawn out of the groove 92 l.A spring unit 32 l for each side is expedient, but it will also bepossible to have one-sided operation. In the embodiment according toFIG. 14, the spring unit 32 m comprises long holes 78 m in the surfacearea 40 m of the protective hood 10 m, in which long holes the bearingbolts 62 m, 63 m of the bearing unit 24 m, 26 m can be displaced counterto spring force in a direction 68 m parallel to the covering wall 36 m.The complete stabilizing bar 14 m is thus mounted displaceably. The twoends of the stabilizing bar 14 m which are arranged on the outside ofthe surface area 40 m have in each case a groove 92 m, into which alocking pin 60 m integrally formed on the surface area 40 m fitspositively. In order to free the stabilizing bar 14 m, the entirestabilizing bar 14 m has to be displaced counter to spring force alongthe long holes 78 m, so that the groove 92 m frees the locking pin 60 m,thus making it possible for the stabilizing bar 14 m to be pivoted. Togenerate the spring force, spring elements are provided in the longholes 78 m and are compressed when the stabilizing bar 14 m isdisplaced. Alternatively, spring-loaded securing, latching or othersecuring against unwanted displacement may also be envisaged (notillustrated). In the embodiment according to FIG. 15, the spring unit 32n comprises on both sides a fastening 98 n in the form of a sprung leverconfigured in one piece with the stabilizing bar 14 n and having anintegrated locking pin 60 n which fits into a corresponding recess inthe surface area 40 n of the protective hood 10 n. On pulling the levercounter to spring force, the locking pin 60 n located on the stabilizingbar 14 n is unlatched, in a direction 68 n perpendicular to a surface ofthe surface area 40 n at the location of the recess, out of thecorresponding recess and thus frees the stabilizing bar 14 n. The springforce required is achieved via the elastic stabilizing bar 14 n itselfFurthermore, it is conceivable that the spring force is generated viaadditionally attached spring elements (not illustrated). Furthermore,the stabilizing bar 14 n may be installed rigidly and the locking pin 60n installed so as to be loaded with spring pressure, so that the lockingpin 60 n itself, presupposing that it has, for example, a rounded orsloped tip, can act in the same way as a ball-latching element (notillustrated). This ball-latching element may be attached both to thestabilizing bar 14 n and to the surface area 14 n of the protective hood10 n. Moreover, latching may also be provided only on one side.Alternatively, the locking pin 60 n may also be provided on the surfacearea 40 n, the fastening 98 n having a corresponding recess for positiveconnection.

FIG. 16 shows a further embodiment of the disclosure. The stabilizingbar 14 o consists of a planar basic body. The hand tool protectiondevice has two bearing units 28 o, 30 o which are provided for mountingthe stabilizing bar 14 o displaceably along a main direction of extentof the stabilizing bar 14 o. The bearing units 28 o, 30 o in each casecomprise a hole contour 64 o integrally formed on a collar 48 o of aprotective hood 10o and taking the form of a slot. The two slots of thetwo bearing units 28 o, 30 o are arranged on the collar 48 o on oppositesides of the protective hood 10 o, in a mounted state the stabilizingbar 14 o being stretched transversely over a reception region 12 o andbeing mounted in the two slots. In order to prevent the stabilizing bar14 o from slipping out, hooks 72 o are formed at a first end of thestabilizing bar 14 o and widen a cross-sectional face of the stabilizingbar 14 o at this point. At a second end of the stabilizing bar 14 o, thelatter is forked and likewise has hooks 74 o there. The stabilizing bar14 o is therefore contoured in a region in which it directly delimitsthe reception region 12 o. By the stabilizing bar 14 o being forked atits second end, a spring element 32 o is formed which is provided forfixing the stabilizing bar 14 o in its position in the mounted state.For mounting the stabilizing bar 14 o, the latter is introduced with thefork in front, in a direction parallel to its main direction of extent,into the first slot of the first bearing 30 o. For this purpose, thefork must be compressed slightly at the end of the stabilizing bar 14 o,so that the stabilizing bar 14 o fits, together with the hook 74 o,through the slot. As soon as the hooks 74 o have passed through thefirst slot, the fork returns to its initial position and the stabilizingbar 14 o can be pushed transversely over the reception region 12 o untilthe hooks 74 o stand at the second slot of the second bearing unit 28 o.The fork has to be slightly compressed anew here, so that thestabilizing bar 14 o, together with the hooks 74 o, can also passthrough this second slot. An insertion depth of the stabilizing bar 14 ois limited by the hooks 72 o which with a marginal region of the firstslot of the first bearing unit 30 o form a stop. When this position isreached, the hooks 74 o on the fork of the stabilizing bar 14 o havealso just passed through the second slot and the fork has returned toits initial position. The stabilizing bar 14 o is consequently fixedsecurely between the two bearing units 28 o, 30 o. In an alternativeembodiment, instead of the hooks 72 o, embossing, a bead, a notchinghammer blow, as it may be referred to, and/or an additional element,such as a bolt, may also be provided in order to define the insertiondepth.

FIG. 17 shows a principle similar to that of FIG. 16, a stabilizing bar14 p having no fork here. The stabilizing bar 14 p is held in twobearing units 28 p, 30 p which are provided for mounting the stabilizingbar 14 p displaceably along a main direction of extent 66 p of thestabilizing bar 14 p. The bearing units 28 p, 30 p in each case comprisea hole contour 64 p integrally formed on a collar 48 p of a protectivehood 10 p and taking the form of a slot. The two slots of the twobearing units 28 p, 30 p are arranged on opposite sides of the collar 48p, in a mounted state the stabilizing bar 14 p being stretchedtransversely over a reception region 12 p and being mounted in the twoslots. At a first end of the stabilizing bar 14 p, a spring unit 32 p isfastened, which is in the form of a flat helical spring which is woundaround the stabilizing bar 14 p and is supported, on the one side, onhooks 74 p formed on the stabilizing bar 14 p and, on the other side, ona margin of the slot of the bearing unit 30 p. Furthermore, thestabilizing bar 14 p has, at its second end lying opposite the helicalspring, a further pair of hooks 72 p which, together with a marginalregion of the slots of the bearing unit 28 p, form a stop when thestabilizing bar 14 p is in a mounted state. It is possible to extractthe stabilizing bar 14 p by means of a sequence of three movements. In afirst step, the stabilizing bar 14 p is pushed counter to spring forceof the helical spring along the main direction of extent 66 p, so thatthe second end of the stabilizing bar 14 p slides out of the slot of thebearing unit 28 p. The hooks 74 p form a stop for this pushing movement.In a second step, the second end of the stabilizing bar 14 p is moved ina direction 70 p perpendicular to a covering wall 36 p of the protectivehood 10 p, until the second end of the stabilizing bar 14 p is locatedabove the bearing unit 28 p, as seen in the direction 70 p. In the thirdand last step, the stabilizing bar 14 p is simply drawn out of the slotof the bearing unit 30 p in the direction 68 p. In an alternativeembodiment, instead of the hooks 72 p, 74 p, any contour widening, inparticular embossing, a bead, a notching hammer blow, as it may bereferred to, and/or an additional element, such as a bolt, which locallyenlarges a cross section of the stabilizing bar 14 p, may be envisaged.

In a further embodiment of the disclosure according to FIG. 18, a flatstabilizing bar 14 q, which has narrower stepped ends at its two ends,is held in two bearing units 28 q, 30 q which are provided for mountingthe stabilizing bar 14 q displaceably along a main direction of extent68 p of the stabilizing bar 14 q. The bearing units 28 q, 30 q in eachcase comprise a hole contour 64 q, 65 q integrally formed on a collar 48q of a protective hood 10 p and taking the form of a slot with a steppedmarginal contour, a first region, facing a covering wall 36 q, of theslot being longer than a second region facing away from the coveringwall 36 q and arranged centrally with respect to the first region. Thetwo slots of the two bearing units 28 q, 30 q are arranged on the collar48 q on opposite sides of the protective hood 10 p, in a mounted statethe stabilizing bar 14 q being stretched transversely over a receptionregion 12 q and being fixed in the two bearing units 28 q, 30 q. In thiscase, two spring units 32 q, 34 q press, with wire yoke springs fastenedto a surface area 40 q of the protective hood 10 q, the stabilizing bar14 q away from the covering wall 36 q in a direction opposite to thedirection 66 q, so that the narrower stepped ends of the stabilizing bar14 q in each case engage positively into the second region of the holecontours 64 q, 65 q. To free the stabilizing bar 14 q, the latter has tobe pressed in the direction 66 q of the covering wall 36 q counter tospring force of the wire yoke springs, until the stepped ends of thestabilizing bar 14 q are in each case located in the first region of thehole contours 64 q, 65 q. In this position, the stabilizing bar 14 q canbe pushed out of the hole contours 64 q, 65 q along its main directionof extent 68 q and extracted. In an alternative embodiment, the springunits 32 i, 32 j may also have leaf springs, corrugated springs and/orany other suitable spring form. It is likewise conceivable that thefixing of the stabilizing bar 14 q is achieved by pulling action insteadof by pressing action, for example when spring elements are arranged ona side of the stabilizing bar 14 q which faces away from the coveringwall 36 q.

An embodiment of the principle shown in FIG. 18, in which only onespring unit 32 r is used, is shown in FIG. 19. Here, a flat stabilizingbar 14 r is likewise mounted in two bearing units 28 r, 30 r, thebearing unit 30 r corresponding in its configuration to the bearing unit28 q from FIG. 18 and the bearing unit 28 r corresponding in itsconfiguration to the bearing unit 30 o from FIG. 16. An indentationlocated in both sides is provided, matching with a hole contour 65 r ofthe bearing unit 30 r, at a first end of the stabilizing bar 14 r andcan be inserted into the hole contour 65 r. The other second end of thestabilizing bar 14 r is mounted in the opposite hole contour 64 q in theform of a slot. On the side of the bearing unit 30 r, the spring unit 32r is provided, having a wire yoke spring which is fastened to a surfacearea 40 r of a protective hood 10 r and which presses the stabilizingbar 14 r in a mounted state away from a covering wall 36 r opposite to adirection 66 r. By an indentation located on both sides on thestabilizing bar 14 r engaging positively into the hole contour 65 r, thestabilizing bar 14 r is held securely in its position. To remove thestabilizing bar 14 r, the latter has to be pressed on the side of thespring unit 32 r in the direction 66 r toward the covering wall 36 r andsubsequently has to be drawn out of the hole contours 64 q, 65 q along amain direction of extent 68 r of the stabilizing bar 14 r.

In a last embodiment of the disclosure according to FIG. 20, astabilizing bar 14 s bent round at its two ends in the direction of acovering wall 36 s of a protective hood 10 s engages vertically, past areception region 12 s, through slots in the covering wall 36 s. The endsof the stabilizing bar 14 s which project on a top side, facing awayfrom the reception region 12 s, of the covering wall 36 s are contouredwith hole contours 64 s, 65 s such that spring units 32 s, 34 s arrangedon the top side of the covering wall 36 s hold the stabilizing bar 14 sin position by means of rotatably spring-loaded locking levers 98 s, 99s. For this purpose, the locking levers 98 s, 99 s engage positivelywith hooks, not illustrated in any more detail, into the hole contours64 s, 65 s. In an alternative embodiment, instead of hole contours 64 s,65 s, projections, into which the hooks of the locking lever 98 s, 99 sengage, may also be provided at the ends of the stabilizing bar 14 s. Togenerate spring force, all the technically expedient spring types may beenvisaged. FIG. 20 illustrates helical springs as outwardly actingcompression springs. Alternatively, tension spring systems or otherspring types are also conceivable.

1. A hand tool protection device, comprising: a protective hood which atleast partially surrounds a reception region for a tool, and at leastone stabilizing bar which is arranged on the protective hood in at leastone operationally ready state and which directly delimits the receptionregion at at least one point.
 2. The hand tool protection deviceaccording to claim 1, further comprising at least one fastening unitconfigured to fasten the stabilizing bar at at least one point on theprotective hood in at least one operationally ready state.
 3. The handtool protection device according to claim 1, further comprising at leastone fastening unit configured to releasably fasten the stabilizing barto at least one component of the hand tool.
 4. The hand tool protectiondevice according to claim 1, further comprising at least one bearingunit configured to pivotably mount the stabilizing bar.
 5. The hand toolprotection device according to claim 1, further comprising at least onebearing unit configured to displaceably mount the stabilizing bar atleast essentially along a main direction of extent of the stabilizingbar.
 6. The hand tool protection device according to claim 1, whereinthe stabilizing bar at least partially surrounds the protective hood. 7.The hand tool protection device according to claim 1, wherein thestabilizing bar is contoured in a region in which it directly delimitsthe reception region.
 8. The hand tool protection device according toclaim 1, further comprising at least one spring unit which is configuredto fix the stabilizing bar in at least one operationally ready state byway of spring force.
 9. The hand tool protection device according toclaim 1, further comprising at least one magnet unit configured to fixthe stabilizing bar in at least one operationally ready state by way ofmagnetic force.
 10. An angle grinder having a tool, comprising: aprotective hood which at least partially surrounds a reception regionfor the tool, and at least one stabilizing bar which is arranged on theprotective hood in at least one operationally ready state and whichdirectly delimits the reception region at at least one point.